fix(AggregationChart): Formatter not being applied

(ex PercentageChart in AR/AP erpnext)

reverse array when maxValue < absMinValue

Hidden elements have zero width, subtracting offset would make the width negative.
These negative values would cascade down to component creation

feat: allow corner radius for heatmap

Update axis-chart-utils.js

Fix issue with overlapping labels on seriese charts.

fix: improve regex to check if string is hex or rgb

Signed-off-by: Chinmay D. Pai <chinmaydpai@gmail.com>

Signed-off-by: Chinmay D. Pai <chinmaydpai@gmail.com>

Update README: Removes duplicate Travis CI build badge

Fix: Sometimes index === -1

Sometimes when mouse-overing container, i got `vendors.app.js:8427 Uncaught TypeError: Cannot read property 'xPos' of undefined` that is caused by `-1` index

Feature/truncate legend dot labels